This was a terrific purchase for my almost 4-year-old son at Christmas. It has almost been a year, and this helmet gets lots of love nearly daily. The fit is quite large on his little head, but there's a lot of room for growth. I can fit it on *my* head, albeit snugly, so I'm not concerned that he'll grow out of it. The chin strap attaches with snaps. I did not attach it right away, thinking it would more than likely frustrate him. I put it on a few months later, however, and it just stays on all the time and he stretches it to cover it over his chin. The face mask is a durable, plastic-covered metal, or so it seems. Definitely not cheap plastic.
He hasn't worn the jerseys yet as it's 2-3 sizes too big. The material is mesh-like with fairly large holes...it reminds me of the old-school pinnies we used to wear in phy. ed. class as a kid. Vikings logo is only on the front....there is no number on the back. All in all, great set, and we have been very pleased.